Plantlets of the ornamental plant Celosia cristata were irradiated with gamma rays to increase their genetic diversity. This study was aimed to establish  the lethal levels of gamma radiation  (LD20, LD30 and LD50) for  C. cristata plantlets.   The irradiation doses used were 0, 25, 50 and 75 Gy. The growth of irradiated plantlets was evaluated to the third generation. Irradiated C. cristata MV1 plantlets showed a decrease in growth, with plantlets irradiated at 75 Gy showing only 30% survival.   Abnormal growth characteristics observed  in the  third generation plantlets included  the shortening of internodes, and curling of leaves.  LD50, LD30 and LD20 of C. cristata were 68.73 Gy, 46.68 Gy and 35.65 Gy, respectively.

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Zingiberaceae, Musaceae, and Cactaceae families are a small part of the diversity of species of tropical plants found in Indonesia. The Zingiberaceae consists of around 50 genera and more than 1,300 species. The uses of Zingiberaceae ranges from food, medicine, industry, to ornamental plants. The constraints in the commercialization of the species of this family are the lack of information on the growth characteristics and cultivation techniques to produce quality crops, and understanding on the phytochemical content of different parts of the plants. This study aims to identify the presence and diversity of Zingiberaceae species in the Central Java region, particularly in Mijen District, Gunung Prau, and Darupono Teak Forest, and to study the uses by the local community by conducting surveys and interviews. We recorded 19 species belonging to the Zingiberaceae in the study area, with a total of 293 individuals from the 10 genera, and Zingiber was the most dominant genus. Five of these species have been used by local residents as spices, 12 species as herbal medicines, and 2 species have potentials as ornamentals or cut flowers, Etlingira foetens and Etlingera elatior.

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Indonesia has diverse flora and fauna, and many species remain largely undiscovered. Documentation and identification of threatened wild ornamental species are increasingly difficult due to ongoing exploitation and land conversion. Mount Prau is one of the popular destinations in Central Java, Indonesia for tourism. Understanding plant biodiversity has enormous value for the economy, ecology, culture, science, and recreation. Our study is aimed to record the diversity and identify the flowering plant species in their native habitat at Mount Prau, Central Java, Indonesia. Our field surveys demonstrated that Mount Prau has abundant wild ornamental plants with wide diversity of taxa, growth habits, and forms. A total of 103 species representing 51 families and 95 genera are identified including trees, shrubs, herbs, and lianas. We also found that among the plant species found in Mount Prau, 24 have morphological characters suitable to be cultivated as ornamental flowers, and 12 as ornamental foliages, and 63 species are medicinal plants. The ornamental criteria of these species were based on the literature describing the morphological and unique characters of leaves and flowers that made them potential to be developed as ornamental plants. In this paper we have provided the current conservation status of the plant species identified and recommendations on their conservation. This study provides baseline data of species found in the Mount Prau areas, and this information could be helpful for further conservations efforts and initiatives.

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<em><span>Dendrobium lasianthera merupakan spesies anggrek </span><span lang="EN-US">yang endemik di </span><span>Papua. Proliferasi atau perbanyakan tanaman melalui kultur jaringan merupakan salah satu alternatif dalam memperbanyak spesies tanaman dengan jumlah individu yang terbatas. Keragaman karakteristik pada tanaman hias, baik yang bersifat alami atau hasil dari induksi mutas</span><span lang="EN-US">i</span><span>, dianggap penting dalam menentukan nilai ekonomisnya. Pengembangan protokol produksi membutuhkan penelitian terkait media yang sesuai untuk memperbanyak tanaman. Penelitian dilakukan dengan mengkulturkan eksplan anggrek Dendrobium lasianthera berupa plb (protocorm-like body) dari anggrek D. lasianthera yang telah diinduksi mutasi melalui perendaman dalam larutan mutagen kolkisin pada penelitian sebelumnya. Pengamatan dilakukan terhadap kemampuan pertumbuhan 960 eksplan dari 16 kombinasi perlakuan (termasuk kontrol) perendaman kolkisin ditumbuhkan pada media MS0 yang ditambahkan sitokinin BA (6-Benzyladenine) sebanyak 1 mgL^-1 dan 2 mgL^-1. Hasil penelitian menunjukkan bahwa eksplan dengan kombinasi perlakuan perendaman yang berbeda memiliki kemampuan pertumbuhan yang berbeda secara nyata, dilihat dari jumlah daun, akar, plb dan tunas baru yang terbentuk selama periode pengamatan.Perbedaan dalam konsentrasi BA dalam media tidak menunjukkan respon yang berbeda nyata dalam jumlah daun dan akar baru yang terbentuk, namun nyata meningkatkan jumlah tunas baru yang terbentuk dan mempercepat pembentukan tunas. Eksplan yang ditumbuhkan pada media BA 1 mgL^-1 memiliki rata-rata waktu awal pembentukan tunas yang lebih singkat dibandingkan dengan media BA 2 mgL^-1. Beberapa planlet hasil induksi mutasi menunjukkan perbedaan fenotipe dari planlet kontrol berupa bentuk daun yang berbeda.</span></em>